//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CParseHandlerDynamicTableScan.cpp
//
//	@doc:
//		Implementation of the SAX parse handler class for parsing dynamic 
//		table scan operators
//---------------------------------------------------------------------------

#include "naucrates/dxl/parser/CParseHandlerDynamicTableScan.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFilter.h"
#include "naucrates/dxl/parser/CParseHandlerProjList.h"
#include "naucrates/dxl/parser/CParseHandlerProperties.h"
#include "naucrates/dxl/parser/CParseHandlerTableDescr.h"
#include "naucrates/dxl/parser/CParseHandlerUtils.h"

#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/operators/CDXLPhysicalDynamicTableScan.h"

using namespace gpdxl;


XERCES_CPP_NAMESPACE_USE

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::CParseHandlerDynamicTableScan
//
//	@doc:
//		Constructor
//
//---------------------------------------------------------------------------
CParseHandlerDynamicTableScan::CParseHandlerDynamicTableScan
	(
	CMemoryPool *mp,
	CParseHandlerManager *parse_handler_mgr,
	CParseHandlerBase *parse_handler_root
	)
	:
	CParseHandlerPhysicalOp(mp, parse_handler_mgr, parse_handler_root)
{
}


//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::StartElement
//
//	@doc:
//		Invoked by Xerces to process an opening tag
//
//---------------------------------------------------------------------------
void
CParseHandlerDynamicTableScan::StartElement
	(
	const XMLCh* const, // element_uri,
	const XMLCh* const element_local_name,
	const XMLCh* const, // element_qname
	const Attributes& attrs
	)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalDynamicTableScan), 
									element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag, str->GetBuffer());
	}
	
	m_part_index_id = CDXLOperatorFactory::ExtractConvertAttrValueToUlong
											(
											m_parse_handler_mgr->GetDXLMemoryManager(), 
											attrs, 
											EdxltokenPartIndexId, 
											EdxltokenPhysicalDynamicTableScan
											);

	m_part_index_id_printable = CDXLOperatorFactory::ExtractConvertAttrValueToUlong
											(
											m_parse_handler_mgr->GetDXLMemoryManager(),
											attrs,
											EdxltokenPartIndexIdPrintable,
											EdxltokenPhysicalDynamicTableScan,
											true, //is_optional
											m_part_index_id
											);

	// create child node parsers in reverse order of their expected occurrence

	// parse handler for table descriptor
	CParseHandlerBase *table_descr_parse_handler = 
			CParseHandlerFactory::GetParseHandler(m_mp, CDXLTokens::XmlstrToken(EdxltokenTableDescr), m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(table_descr_parse_handler);

	// parse handler for the filter
	CParseHandlerBase *filter_parse_handler = CParseHandlerFactory::GetParseHandler(m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarFilter), m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(filter_parse_handler);

	// parse handler for the proj list
	CParseHandlerBase *proj_list_parse_handler = 
			CParseHandlerFactory::GetParseHandler(m_mp, CDXLTokens::XmlstrToken(EdxltokenScalarProjList), m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(proj_list_parse_handler);
	
	//parse handler for the properties of the operator
	CParseHandlerBase *prop_parse_handler = 
			CParseHandlerFactory::GetParseHandler(m_mp, CDXLTokens::XmlstrToken(EdxltokenProperties), m_parse_handler_mgr, this);
	m_parse_handler_mgr->ActivateParseHandler(prop_parse_handler);
	
	// store child parse handlers in array
	this->Append(prop_parse_handler);
	this->Append(proj_list_parse_handler);
	this->Append(filter_parse_handler);
	this->Append(table_descr_parse_handler);
}

//---------------------------------------------------------------------------
//	@function:
//		CParseHandlerDynamicTableScan::EndElement
//
//	@doc:
//		Invoked by Xerces to process a closing tag
//
//---------------------------------------------------------------------------
void
CParseHandlerDynamicTableScan::EndElement
	(
	const XMLCh* const, // element_uri,
	const XMLCh* const element_local_name,
	const XMLCh* const // element_qname
	)
{
	if (0 != XMLString::compareString(CDXLTokens::XmlstrToken(EdxltokenPhysicalDynamicTableScan), 
									element_local_name))
	{
		CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag, str->GetBuffer());
	}

	// construct node from the created child nodes
	CParseHandlerProperties *prop_parse_handler = dynamic_cast<CParseHandlerProperties *>((*this)[0]);
	CParseHandlerProjList *proj_list_parse_handler = dynamic_cast<CParseHandlerProjList*>((*this)[1]);
	CParseHandlerFilter *filter_parse_handler = dynamic_cast<CParseHandlerFilter*>((*this)[2]);
	CParseHandlerTableDescr *table_descr_parse_handler = dynamic_cast<CParseHandlerTableDescr*>((*this)[3]);


	// set table descriptor
	CDXLTableDescr *table_descr = table_descr_parse_handler->GetDXLTableDescr();
	table_descr->AddRef();
	CDXLPhysicalDynamicTableScan *dxl_op = 
			GPOS_NEW(m_mp) CDXLPhysicalDynamicTableScan(m_mp, table_descr, m_part_index_id, m_part_index_id_printable);

	m_dxl_node = GPOS_NEW(m_mp) CDXLNode(m_mp, dxl_op);	
	// set statictics and physical properties
	CParseHandlerUtils::SetProperties(m_dxl_node, prop_parse_handler);

	// add constructed children	
	AddChildFromParseHandler(proj_list_parse_handler);
	AddChildFromParseHandler(filter_parse_handler);

#ifdef GPOS_DEBUG
	dxl_op->AssertValid(m_dxl_node, false /* validate_children */);
#endif // GPOS_DEBUG
	
	// deactivate handler
	m_parse_handler_mgr->DeactivateHandler();
}

// EOF

